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When diborane (B2H6) dissociates in either solvents, such as tetrahydrofuran (THF), a complex between borane (BH3) and the ether is formed. (a) In the Lewis sense, what is the function of BH3 as it
What five chemical tests would be performed to determine the difference between the starting alkene and the alcohol product of a hydroboration-oxidation reaction
What does the structure of isopinocampheol (the product of a hydroboration-oxidation reaction of (1R)-(+)-alpha-Pinene) indicate about the mechanism of the reaction in terms of regioselectivity and
A flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 50.0 mL of 0.230 M NaOH. what volume of NaOH is needed to reach the end point of the titration
Draw chemical structures to explain why a water molecule might be essential to producing a stable crystal of caffeine.
The density of water is 1.00 g/ml, the density of dichloromethane is 1.32 g/ml. If you mix dichloromethane and water together, which layer will be on top and which layer will be on the bottom
A general chemistry student found a chunk of metal in the basement of a friend's house. To figure out what it was, he used the ideas just developed in class about density.
Some aromatic compounds also undergo nucleophilic substitution, propose a mechanism for this reaction and indicate what types of substituents would be expected to be most reactive
What volumes of water (steam) and nitrogen monoxide are measure under same conditions of T and P.
Express your answer as a chemical equation. Enter NOREACTION if no reaction occurs. Identify all of the phases in your answer.
The half-life of carbon-14 is 5730 years. Therefore, 5730 years after being cut from a tree, a piece of wood will have 50.0 % of the carbon-14 that it had originally. What percentage of the original
The label on a bottle of concentrated HCl says the contents are 36% HCl by mass and have a density of 1.179 g/mL. What is the Molarity of the Conc. HCl.
Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the ^14C has decayed to 1/32.0 of the original amount. How long ago was this plant alive
A nurse administered 3.50mL of a radioisotope solution that has an activity of 135pCi/mL. What total dose of the radioisotope did the patient receive
In the distillation of a flammable mixture why is it important to keep the graduated cylinder distillation receiver as high up the bottom of the bent vacuum adapter as possible
A volume of 40.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 19.2 mL of 1.50 M H2SO4 was neede
An analyst collects and melts 555.0 g of snow. a 100 g portion of the resulting water is made basic with ammonia, treated with cyanide and to mask other metal ions, and then extracted with 10.0 mL o
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium
When a 9.92-g sample of gaseous hydrogen bromide dissolves in 45.5 g of water in a coffee-cup calorimeter the temperature rises from 25.00 oC to 69.79 oC. Calculate H in kJ per mol of HBr for the s
A volume of 40.0 of aqueous potassium hydroxide () was titrated against a standard solution of sulfuric acid (). What was the molarity of the solution if 19.2 of 1.50 was needed? The equation is 2K
What is the final temperature in a squeezed cold pack that contains 50.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18 for the solution, an initial temperature of 27.0 C, a
At the unspecified temperature dinitrogentetraoxide partially decomposes according to the following equilibrium
At a higher temperature, 373K, dinitrogentetraoxide partially decomposes according to the same equilibrium reaction but with slightly different results. The chemical equation is again
At a distance of 42 ft, an ionizing radiation source delivers 3.5 rem of radiation. How close could you get to the source and still have no biological effects
What is the complete and balanced chemical equation for. Lithium Sulfate+Lead(II) acetate ? Copper(II) nitrate+Sodium sulfide? Strontium nitrate+potassium iodide